Type of Steel Bars

 

Generally there are two types of steel bars ("Sariya" in hindi) available in the market.
  1. Mild steel bars

  2. Deformed steel bars

Steel bars used for construction work

(This Picture is Contributed by "Monu")

Mild steel bars (as per IS: 432, part-I -1982)

Mild steel bars are used for tensile stress of RCC (Reinforced cement concrete) slab beams etc. in reinforced cement concrete work. These steel bars are plain in surface and are round sections of diameter from 6 to 50 mm. These rods are manufactured in long lengths and can be cut quickly and be bent easily without damage.

Deformed steel bars (as per IS: 1786-1985)

As deformed bars are rods of steels provided with lugs, ribs or deformation on the surface of bar, these bars minimize slippage in concrete and increases the bond between the two materials. Deformed bars have more tensile stresses than that of mild steel plain bars. These bars can be used without end hooks. The deformation should be spaced along the bar at substantially uniform distances. 

To limit cracks that may develop in reinforced concrete around mild steel bars due to stretching of bars and some lose of bond under load it is common to use deformed bars that have projecting ribs or are twisted to improve the bond with concrete. These bars are produced in sections from 6 mm to 50 mm dia.
In addition the strength of bonds of deformed bars calculated should be 40 to 80 % higher than that of plain round bars of same nominal size. And it has more tensile stress than that of plain round bars of same nominal size.
Cold twisted deformed (Ribbed or Tor Steel Bars) bars are recommended as best quality steel bars for construction work by structural Engineer.

Various Grades of Mild Steel Bars

Reinforcement bars in accordance with standard IS No. 432 part-I can be classified into following types.   

1) Mild Steel Bars: Mild steel bars can be supplied in two grades 

     a)Mild steel bars grade-I designated as Fe 410-S or Grade 60
     b) Mild steel bars grade-II designated as Fe-410-o or Grade 40

2) Medium Tensile Steel Bars designated as Fe- 540-w-ht or Grade 75


 

Physical Requirement:

 S.No Types of nominal size of bars   Ultimate Tensile Stress N/mm2 minimum  Yield Stress N/mm2  Elongation Percent minimum
 1. Mild Steel Grade I or Grade 60      
   For bars up to 20mm  410 250  23 
   For bars above 20mm upto 50 mm  410 240  23 
 2.  Mild Steel Grade-II or Grade 40      
   For bar up to 20mm  370 225 23 
   For bars above 20mm upto 50 mm  370 215  23 
 3. Medium Tensile Steel Grade-75       
   for bars up to 16mm  540 350 20
   for bars above 16 mm up to 32 mm    540 340  20 
   for bars above 32 mm up to 50 mm  510 330  20 

Grade II Mild steel bar are not recommended for use in structures located in earth quake zones subject to severe damage and for structures subject to dynamic loading (other than wind loading) such as railways and highways bridges.

Every lot or consignment of mild steel bars brought at the site of work should be tested in laboratory before use in the work. However for small work one can use mild steel bars on the basis of verifying tests results made by manufacturer in his own laboratory; which are available with supplier.
Some of manufacturers stamped MS bars grade with their make /name and also give certification of test and grade. On the basis of the above information you can store mild steel bars grade-wise at the site of work.

Steel Bars for RCC Work 

All finished steel bars for reinforced work should be neatly rolled to the dimension and weights as specified. They should be sound, free from cracks, surface flaws, laminations, rough, jagged and imperfect edges and other defects. It should be finished in a work manlike manner. 

Column made of steel bars

(This Picture is Contributed by "Ahmed")

General precautions for steel bars in reinforcement

  • Steel bars are clear, free from loose mil scales, dust and loose rust coats of paints, oil or other coatings which may destroy or reduce bond strength.
  • Steel bars should be stored in such a way as to avoid distortion and to prevent deterioration and corrosion.   
  • Steel bars should not be clean by oily substance to remove the rust.
  • The bar is bent correctly and accurately to the size and shape as shown in drawings. 
  • If possible, the bar of full length is used.
  • Overlapping bars do not touch each other and these should be kept apart with concrete.
  •  The overlap if given should be staggered.
  • The cranks in the bar at the end should be kept in position by using spots.
  • The steel bars should not be disturbed while lying cements concrete.
  • Required cover under steel bars should be given before laying the cement concrete.  
  • No over lap is given in the bar having a diameter more than 36 mm, if required, the bar should be welded.
     

Weight of Different Steel Bars

When we want to purchase Mild steel members from the market, the shopkeeper quotes the price of steel members in weight. 
When any type of steel members for use in house construction is required, we calculate the length of steel member in feet or meter but we are ignorant about the weight of steel.  

Here are details of weight per meter for various types of steel members:-

This will help us for estimated weight and cost. It will also help at the time of purchase to avoid pilferage in weight.

 M S Steel round & square Bar

 Sr.No.   Dia of steel bar   Weight per meter
 

 Round Bar   Square Bar  
 a  6 mm
 0.22 Kg.
0.28 Kg 
 b  8 mm
 0.39 Kg
0.50 Kg 
 c  10 mm
 0.62 Kg
0.78 Kg 
 d  12 mm
 0.89 Kg
 1.13 Kg
 e
 16 mm
 1.58 Kg
 2.01 Kg
 f   20 mm
 2.46 Kg
 3.14 Kg
 g  25 mm
 3.85 Kg
 4.91 Kg
 h  28 mm
 4.83 Kg
 6.15 Kg
 i  32 mm
 6.31 Kg
 8.04 Kg
 j  36 mm
 7.99 Kg
 10.17 Kg
 k  40 mm
 9.86 Kg
 12.56 Kg
 l  45 mm
 12.49 Kg
 15.90 Kg
 m  50 mm
 15.41 Kg
19.62 Kg
 
84  Comment(s)
123Next  >>
Anonymous
By Anonymous - On 6/19/2015 2:52:13 PM
in structural work where can we apply 50mm steel.
 
Anonymous
By Anonymous - On 6/18/2015 6:38:29 PM
Sir I'm study diploma in civil engineering
 
Anonymous
By Anonymous - On 6/13/2015 10:53:38 AM
Enter your feedback about this article
 
moeen akhter
By moeen akhter -  On  6/3/2015 2:54:18 PM
great web site very informative
informationcells.com
 
Anonymous
By Anonymous - On 4/29/2015 6:55:35 AM
It's very essay and ussfull.
So,thanks to
 
Anonymous
By Anonymous - On 3/6/2015 9:36:38 PM
Polichu
 
Anonymous
By Anonymous - On 1/20/2015 8:28:38 PM
It was very useful... and being used forever...
 
Anonymous
By Anonymous - On 9/22/2014 2:35:15 PM
Very useful!
Thanks
 
Anonymous
By Anonymous - On 7/1/2014 11:59:18 AM
im just interested in this but can steel loose weight from oxidation or by any other means when its stored in a dry and cold place?...
 
Anonymous
By Anonymous - On 6/23/2014 10:24:44 AM
sir i need the overlapping length of steel in rcc
 
Anonymous
By Anonymous - On 12/9/2013 2:59:56 PM
good
 
Anonymous
By Anonymous - On 12/6/2013 7:47:13 PM
thank u , im searching this for 3 days in google but i didnt find , i find in yahoo search, its very help fulll
 
Anonymous
By Anonymous - On 10/18/2013 2:12:43 PM
i want more types of steel bars used in construction.plz send me the information
 
Anonymous
By Anonymous - On 9/22/2013 3:39:28 PM
could the "square bar" you mentioned mean high "tensile/deformed bars"?
 
Helena Dorbor
By Helena Dorbor -  On  3/27/2013 10:55:49 PM
please email all the prizes for steel.
 
Anonymous
By Anonymous - On 3/9/2013 6:33:32 PM
what is the overlaps of hysd bars?
 
Anonymous
By Anonymous - On 12/18/2012 12:49:51 AM
very informative and useful informations
 
Anonymous
By Anonymous - On 10/25/2012 9:23:16 PM
a useful article
 
Anonymous
By Anonymous - On 10/4/2012 10:20:06 AM
Sir, i want information about concreet lanter. Area is 1225 sqr feet. I want lanter thikness 6 inch. Then how much sariya and cement want for that. I want diffrance between sariya 9/9 inch. It good or bad. Sariya size is 3 and 4 soot. Then please guide me by email.
 
Anonymous
By Anonymous - On 10/4/2012 10:19:48 AM
Sir, i want information about concreet lanter. Area is 1225 sqr feet. I want lanter thikness 6 inch. Then how much sariya and cement want for that. I want diffrance between sariya 9/9 inch. It good or bad. Sariya size is 3 and 4 soot. Then please guide me by email.
 
Anonymous
By Anonymous - On 9/7/2012 8:15:44 AM
could the "square bar" you mentioned mean high "tensile/deformed bars"?
 
Anonymous
By Anonymous - On 7/16/2012 11:35:10 AM
Not much use>
I asked which IS code practice prohibits 6mm dia ms as main reinforcement.
 
Anonymous
By Anonymous - On 7/9/2012 2:53:53 PM
thanks....its help full for specially freshers engineers....
 
sohail
By sohail -  On  6/11/2012 10:08:55 PM
ita a very nice artical..would you like to tell how to calculate loads
 
sravan reddy
By sravan reddy -  On  5/29/2012 6:54:26 PM
excellent
 
donesh bajaj
By donesh bajaj -  On  3/26/2012 12:33:20 PM
Great
 
Anonymous
By Anonymous - On 3/21/2012 1:50:49 AM
can i use steel reinforcement from different manufacturers in the same concrete section of the same grade of steel
 
Anonymous
By Anonymous - On 2/1/2012 1:27:14 PM
any one need cold twisted or deform bar's contact me m.aamir sales officer
 
Anonymous
By Anonymous - On 12/1/2011 11:08:19 PM
Very interesting and useful for civil engineers
 
SHAMSUDDIN AHMED
By SHAMSUDDIN AHMED -  On  11/27/2011 11:45:21 AM
how much quantity of steel required for 1m3 concrete for
foundation, columns, beams and slab
 
SHAMSUDDIN AHMED
By SHAMSUDDIN AHMED -  On  11/27/2011 11:38:58 AM
A very helpful topic
thanks have a nice day
 
Anonymous
By Anonymous - On 11/14/2011 12:05:39 PM
Thank you Ghar excepret
Its really helpfull site,
But one item is missed so plz any body tell me how can stop the leakeage in R.C.C flat roof slabs...?
 
Anonymous
By Anonymous - On 10/8/2011 9:38:26 PM
steel weight fourmula
 
Anonymous
By Anonymous - On 10/1/2011 2:00:57 PM
It was very useful. thanks.
 
K.V Reddy
By K.V Reddy -  On  6/26/2011 7:34:57 PM
I am going to to make a house, ground + 2 floor, i need a footing design, area is 1500 SQft, residential house, can anybody help me, particularly i am looking, foundation, footings steel design
 
sheotaj singh
By sheotaj singh -  On  5/31/2011 5:12:19 PM
Hi I am planning to construct Ground floor and upto second floor house . Total covered area is 900 sqft and 12 pillars may be require for it. Kindly let me know the thickness (dia)of steel bars for coloumn and beam
 
binuraj
By binuraj -  On  4/8/2011 12:50:12 PM
which type of steel is good for construction purpose?
ms tor, tested tor, steel tor or tmt
 
Anonymous
By Anonymous - On 3/27/2011 9:23:45 PM
calculate the tensile test of steel.
 
Anonymous
By Anonymous - On 3/21/2011 12:26:14 AM
Enter your feedback about this article. I appretiate the contribution given by some scolers. But how do i solve my problem concerning achitectural disign?
 
Anonymous
By Anonymous - On 3/14/2011 3:12:26 PM
Please kindly send me the structural advantages of Ribbed hot rolled bars compared to square cold twisted bars.
 
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